SIST EN 62305-3:2006
(Main)Protection against lightning - Part 3: Physical damage to structures and life hazard
Protection against lightning - Part 3: Physical damage to structures and life hazard
This part of IEC 62305 provides the requirements for protection of a structure against physical damage by means of a lightning protection system (LPS), and for protection against injury to living beings due to touch and step voltages in the vicinity of an LPS (see IEC 62305-1). This standard is applicable to: a) design, installation, inspection and maintenance of an LPS for structures without limitation of their height; b) establishment of measures for protection against injury to living beings due to touch and step voltages.
Blitzschutz - Teil 3: Schutz von baulichen Anlagen und Personen
Protection contre la foudre - Partie 3: Dommages physiques sur les structures et risques humains
Donne des exigences pour la protection des structures contre les dommages physiques par un système de protection contre la foudre (SPF) et pour la protection contre les lésions d'êtres vivants en raison des tensions de contact et de pas à proximité du SPF, à l'extérieur des structures (voir la CEI 62305-1). La présente norme est applicable: a) à la conception, à l'installation, à l'inspection et à la maintenance des SPF des structures, sans limitation de hauteur; b) à la mise en uvre de mesures pour la protection contre les lésions d'êtres vivants en raison de tensions de contact et de pas.
Zaščita pred delovanjem strele - 3. del: Fizična škoda na zgradbah in nevarnost za živa bitja (IEC 62305-3:2006, spremenjen)
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62305-3:2006
01-junij-2006
1DGRPHãþD
SIST IEC 61024-1:1996
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Protection against lightning -- Part 3: Physical damage to structures and life hazard
Blitzschutz -- Teil 3: Schutz von baulichen Anlagen und Personen
Protection contre la foudre -- Partie 3: Dommages physiques sur les structures et risques
humains
Ta slovenski standard je istoveten z: EN 62305-3:2006
ICS:
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
SIST EN 62305-3:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 62305-3:2006
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SIST EN 62305-3:2006
EUROPEAN STANDARD
EN 62305-3
NORME EUROPÉENNE
February 2006
EUROPÄISCHE NORM
ICS 29.020; 91.120.40
English version
Protection against lightning
Part 3: Physical damage to structures and life hazard
(IEC 62305-3:2006, modified)
Protection contre la foudre Blitzschutz
Partie 3: Dommages physiques Teil 3: Schutz von baulichen Anlagen
sur les structures et risques humains und Personen
(CEI 62305-3:2006, modifiée) (IEC 62305-3:2006, modifiziert)
This European Standard was approved by CENELEC on 2006-02-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Rumania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62305-3:2006 E
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SIST EN 62305-3:2006
EN 62305-3:2006 - 2 -
Foreword
The text of document 81/264/FDIS, future edition 1 of IEC 62305-3, prepared by IEC TC 81, Lightning
protection, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 62305-2 on 2006-02-01.
A draft amendment, prepared by the Technical Committee CENELEC TC 81X, Lightning protection,
containing some common modifications to document 81/264/FDIS, was submitted to the formal vote and
was approved by CENELEC on 2006-02-01 for inclusion into EN 62305-2.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2006-11-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-02-01
with the EN have to be withdrawn
This European Standard makes reference to International Standards. Where the International Standard
referred to has been endorsed as a European Standard or a home-grown European Standard exists, this
European Standard shall be applied instead. Pertinent information can be found on the CENELEC web
site.
__________
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SIST EN 62305-3:2006
- 3 - EN 62305-3:2006
Endorsement notice
The text of the International Standard IEC 62305-2:2006 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
3 Terms and definitions
Modify the following definitions as follows:
3.16
connecting component
part of an external LPS which is used for the connection of conductors to each other or to metallic
installations, defined as in EN 50164 series
3.17
fixing component
part of an external LPS which is used to fix the elements of the LPS to the structure to be protected,
defined as in EN 50164 series
Annex E
E.4.3.3 Welding or clamping to the steel-reinforcing rods
Modify the Note as follows:
NOTE Specifically designed clamps complying with and tested according to the EN 50164 series shall be used.
E.4.3.7 Down-conductors
Modify the 12th paragraph as follows:
If steel structures are used as down-conductors every steel column shall be connected to the steel
reinforcing rods of the concrete foundation according to Figure E.8 by proprietary bonding points
complying with the EN 50164 series
E.5.2.4.1 General information
Modify the first paragraph as follows:
The maximum permissible temperature for a conductor will not be exceeded if the cross-section complies
with Table 6 and the EN 50164 series.
E.5.2.4.2 Non-isolated air-termination
Add at the end of the second paragraph:
NOTE Z1 For more details see EN 50164 series.
E.5.5 Components
Replace the text of the subclause by:
Components of LPS shall withstand the electromagnetic effects of lightning current and predictable
accidental stresses without being damaged. This can be achieved by choosing components that have
successfully been tested in accordance with the EN 50164 series.
All components shall comply with the EN 50164 series.
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SIST EN 62305-3:2006
EN 62305-3:2006 - 4 -
E.5.6.1 Mechanical design
Modify the 6th paragraph as follows:
The LPS designer and the LPS installer should specify conductor fasteners and fixtures which will
withstand the electrodynamic forces of lightning current in the conductors and also allow for the
expansion and contraction of conductors due to the relevant temperature rise according to the EN 50164
series.
E.5.6.2.1 Materials
Modify the first paragraph 1 as follows:
LPS materials and conditions of use are listed in Table 5 and the EN 50164 series.
E.5.6.2.2.1 Metals in soil and air
Modify the Note as follows:
NOTE Spark gaps having a protection level U of 2,5 kV and a minimum I of 50 kA (10/350 µs) complying with EN 50164-3 are
p imp
suitable.
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SIST EN 62305-3:2006
IEC 62305-3
Edition 1.0 2006-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Protection against lightning –
Part 3: Physical damage to structures and life hazard
Protection contre la foudre –
Partie 3: Dommages physiques sur les structures et risques humains
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XG
CODE PRIX
ICS 29.020; 91.120.40 ISBN 2-8318-8366-0
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SIST EN 62305-3:2006
62305-3 © IEC:2006 – 3 – – 2 – 62305-3 © IEC:2006
CONTENTS
FOREWORD. 6
INTRODUCTION. 8
1 Scope. 9
2 Normative references . 9
3 Terms and definitions .10
4 Lightning protection system (LPS) .13
4.1 Class of LPS .13
4.2 Design of the LPS .14
4.3 Continuity of steelwork in reinforced concrete structures .14
5 External lightning protection system .15
5.1 General .15
5.2 Air-termination systems.15
5.3 Down-conductor systems.19
5.4 Earth-termination system.22
5.5 Components .24
5.6 Materials and dimensions .26
6 Internal lightning protection system .29
6.1 General .29
6.2 Lightning equipotential bonding .29
6.3 Electrical insulation of the external LPS .32
7 Maintenance and inspection of an LPS .33
7.1 Application of inspections.33
7.2 Order of inspections .33
7.3 Maintenance.33
8 Protection measures against injury to living beings due to touch and step voltages .34
8.1 Protection measures against touch voltages.34
8.2 Protection measures against step voltages.34
Annex A (normative) Positioning the air-termination system.35
Annex B (normative) Minimum cross-section of the entering cable screen in order to
avoid dangerous sparking .41
Annex C (informative) Partitioning of the lightning current amongst down-conductors .42
Annex D (informative) Additional information for LPS in the case of structures with a
risk of explosion.46
Annex E (informative) Guidelines for the design, construction, maintenance and
inspection of lightning protection systems . 52
Bibliography.154
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SIST EN 62305-3:2006
62305-3 © IEC:200662305-3 © IEC:2006 – 5 – – 3 –
Figure 1 – Loop in a down-conductor .20
Figure 2 – Minimum length l of each earth electrode according to the class of LPS.22
1
Figure A.1 – Volume protected by a vertical air-termination rod .35
Figure A.2 – Volume protected by a vertical air-termination rod .36
Figure A.3 – Volume protected by a wire air-termination system .36
Figure A.4 – Volume protected by isolated wires combined in a mesh according to the
protective angle method and rolling sphere method .37
Figure A.5 – Volume protected by non-isolated wires combined in a mesh according to
the mesh method and the protective angle method .38
Figure A.6 – Design of an air-termination system according to the rolling sphere
method .39
Figure C.1 – Values of coefficient k in the case of a wire air-termination system and a
c
type B earth-termination system.43
Figure C.2 – Values of coefficient k in the case of a mesh air-termination system and
c
type B earth-termination system.44
Figure C.3 – Examples of calculation of the separation distance in the case of a
meshed air-termination system, an interconnecting ring of the down-conductors at
each level and a type B earth-termination system .45
Figure E.1 – LPS design flow diagram . 54
Figure E.2 – Values of coefficient k in case of a sloped roof with air-termination on
c
the ridge and a type B earthing system . 61
Figure E.3 – LPS design for a cantilevered part of a structure. 62
Figure E.4 – Equipotential bonding in a structure with a steel reinforcement . 64
Figure E.5 – Welded joints of reinforcing rods in reinforced concrete, if permitted. 65
Figure E.6 – Example of clamps used as joints between reinforcing rods and
conductors. 66
Figure E.7 – Examples for connection points to the reinforcement in a reinforced
concrete wall . 67
Figure E.8 – Use of metallic facade as natural down-conductor system and connection
of facade supports . 70
Figure E.9 – Connection of the continuous strip windows to a metal façade covering. 72
Figure E.10 – Internal down-conductors in industrial structures. 75
Figure E.11– Installation of bonding conductors in reinforced concrete structures and
flexible bonds between two reinforced concrete parts . 77
Figure E.12 – Protective angle method air-termination design for different heights
according to Table 2 . 81
Figure E.13 – Isolated external LPS using two isolated air-termination masts designed
according to the protective angle air-termination design method . 82
Figure E.14 – Isolated external LPS using two isolated air-termination masts,
interconnected by horizontal catenary wire . 83
Figure E.15 – Example of design of an air-termination of a non-isolated LPS by air-
termination rods. 84
Figure E.16 – Example of design of an air-termination of a non isolated LPS by a
horizontal wire according to the protective angle air-termination design method . 85
Figure E.17 – Protected volume of an air- termination rod or mast on a sloped surface. 86
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SIST EN 62305-3:2006
62305-3 © IEC:2006 – 7 – – 4 – 62305-3 © IEC:2006
Figure E.18 – Design of an LPS air-termination according to the rolling sphere method,
protective angle method, mesh method and general arrangement of air-termination
elements. 88
Figure E.19 – Design of an LPS air-termination conductor network on a structure with
complicated shape. 89
Figure E.20 – Space protected by two parallel air-termination horizontal wires or two
air-termination rods (r > h ). 90
t
Figure E.21 – Points at which lightning will strike a building. 92
Figure E.22 – Example of design of non-isolated LPS air-termination according to the
mesh method air-termination design . 96
Figure E.23 – Some examples of details of an LPS on a structure with sloped tiled roofs. 99
Figure E.24 – Construction of an LPS using natural components on the roof of the
structure .101
Figure E.25 – Positioning of the external LPS on a structure made of insulating
material e.g. wood or bricks with a height up to 60 m with flat roof and with roof fixtures .102
Figure E.26 – Construction of air-termination network on a roof with conductive
covering where puncturing of the covering is not acceptable.103
Figure E.27 – Construction of external LPS on a structure of steel-reinforced concrete
using the reinforcement of the outer walls as natural components.104
Figure E.28 – Example of an air-termination stud used on car park roofs .105
Figure E.29 – Air-termination rod used for protection of a metallic roof fixture with
electric power installations which are not bonded to the air-termination system .106
Figure E.30 – Method of achieving electrical continuity on metallic parapet cladding .107
Figure E.31 – Metallic roof fixture protected against direct lightning interception,
connected to air-termination system.110
Figure E.32 – Example of construction of lightning protection of a house with a TV
antenna using the mast as an air-termination rod.112
Figure E.33 – Installation of lightning protection of metallic equipment on a roof against
a direct lightning flash.113
Figure E.34 – Connection of natural air-termination rod to air-termination conductor.115
Figure E.35 – Construction of the bridging between the segments of the metallic
façade plates .116
Figure E.36 – Installation of external LPS on a structure of isolating material with
different roof levels .118
Figure E.37 – Examples of geometry of LPS conductors .119
Figure E.38 – Construction of an LPS using only two down-conductors and foundation
earth electrodes.120
Figure E.39 – Examples of connection of earth termination to the LPS of structures
using natural down-conductors (girders) and detail of a test joint .124
Figure E.40 – Construction of foundation earth ring for structures of different
foundation design .128
Figure E.41 – Examples of two vertical electrodes in type A earthing arrangement .130
Figure E.42 – Meshed earth termination system of a plant .134
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SIST EN 62305-3:2006
62305-3 © IEC:200662305-3 © IEC:2006 – 9 – – 5 –
Figure E.43 – Examples of separation distance between the LPS and metal
installations .140
Figure E.44 – Directions for calculations of the separation distance s for a worst case
lightning interception point at a distance l from the reference point according to 6.3 .141
Figure E.45 – Example of an equipotential bonding arrangement .144
Figure E.46 – Example of bonding arrangement in a structure with multiple point
entries of external conductive parts using a ring electrode for interconnection of
bonding bars.145
Figure E.47 – Example of bonding in the case of multiple point entries of external
conductive parts and an electric power or communication line using an internal ring
conductor for interconnection of the bonding bars .146
Figure E.48 – Example of bonding arrangement in a structure with multiple point
entries of external conductive parts entering the structure above ground level .147
Table 1 – Relation between lightning protection levels (LPL) and class of LPS (see
IEC 62305-1) .13
Table 2 – Maximum values of rolling sphere radius, mesh size and protection angle
corresponding to the class of LPS.16
Table 3 – Minimum thickness of metal sheets or metal pipes in air-termination systems .18
Table 4 – Typical values of the distance between down-conductors and between ring
conductors according to the class of LPS.20
Table 5 – LPS materials and conditions of use.25
Table 6 – Material, configuration and minimum cross-sectional area of air-termination
conductors, air-termination rods and down-conductors.27
Table 7 – Material, configuration and minimum dimensions of earth electrodes.28
Table 8 – Minimum dimensions of conductors connecting different bonding bars or
connecting bonding bars to the earth-termination system.30
Table 9 – Minimum dimensions of conductors connecting internal metal installations to
the bonding bar.30
Table 10 – Isolation of external LPS – Values of coefficient k .32
i
Table 11 – Isolation of external LPS – Values of coefficient k .32
c
Table 12 – Isolation of external LPS – Values of coefficient k .33
m
Table B.1 – Cable length to be considered according to the condition of the screen.41
Table C.1 – Values of coefficient k .42
c
Table E.1 – Suggested fixing centres. 97
Table E.2 – Maximum period between inspections of an LPS.149
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SIST EN 62305-3:2006
62305-3 © IEC:2006 –– 6 – 11 – 62305-3 © IEC:2006
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
PROTECTION AGAINST LIGHTNING –
Part 3: Physical damage to structures and life hazard
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC national committees). The object of the IEC is to promote
international cooperation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes international standards, technical specifications,
technical reports, publicly available specifications (PAS) and guides (hereafter referred to as “IEC
publication(s)”). Their preparation is entrusted to technical committees; any IEC national committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates
closely with the International Organization for Standardization (ISO) in accordance with conditions determined
by agreement between the two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested IEC national committees.
3) IEC publications have the form of recommendations for international use and are accepted by IEC national
committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
publications is accurate, the IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC national committees undertake to apply IEC publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to the IEC or its directors, employees, servants or agents including individual experts
and members of its technical committees and IEC national committees for any personal injury, property damage
or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC publication or any other IEC
publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC publication may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 62305-3 has been prepared by IEC technical committee 81:
Lightning protection.
The IEC 62305 series (Parts 1 to 5), is produced in accordance with the new Publications`
Plan, approved by National Committees (81/171/RQ (2001-06-29)), which restructures in a
more simple and rational form and updates the Publications of the IEC 61024 series, the IEC
61312 series and the IEC 61663 series.
The text of this first edition of IEC 62305-3 is compiled from and replaces
– IEC 61024-1, first edition (1990).
– IEC 61024-1-2, first edition (1998).
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SIST EN 62305-3:2006
62305-3 © IEC:200662305-3 © IEC:2006 –– 7 – 13 –
The text of this standard is based on the following documents:
FDIS Report on voting
81/264/FDIS 81/269/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above Table.
This publication has been drafted, as close as possible, in accordance with the ISO/IEC
Directives, Part 2.
IEC 62305 consists of the following parts, under the general title Protection against lightning:
Part 1: General principles
Part 2: Risk management
Part 3: Physical damage to structures and life hazard
Part 4: Electrical and electronic systems within structures
1
Part 5: Services
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC website "http://webstore.iec.ch" in the data
related to the specific publication. At
...
SLOVENSKI SIST EN 62305-3
STANDARD
junij 2006
Zaščita pred delovanjem strele – 3. del: Fizična škoda na zgradbah in
nevarnost za živa bitja (IEC 62305-3:2006, spremenjen)
Protection against lightning – Part 3: Physical damages to structures and life
hazard (IEC 62305-3:2006, modified)
Protection contre la foudre – Partie 3: Dommages physiques sur les structures et
risques humains (CEI 62305-3:2006, modifieé)
Blitzschutz – Teil 3: Schutz von baulichen Anlagen und Personen (IEC 62305-
2:2006, modifiziert)
Referenčna oznaka
ICS 91.120.40 SIST EN 62305-3:2006 (sl)
Nadaljevanje na straneh II in III ter od 1 do 137
© 2011-06. Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov ni dovoljeno.
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SIST EN 62305-3 : 2006
NACIONALNI UVOD
Standard SIST EN 62305-3 (sl), Zaščita pred delovanjem strele – 3. del: Fizična škoda na zgradbah in
nevarnost za živa bitja (IEC 62305-3:2006, spremenjen), 2006, ima status slovenskega standarda in je
enakovreden evropskemu standardu EN 62305-3 (en), Protection against lightning – Part 3: Physical
damages to structures and life hazard (IEC 62305-3:2006, modified), 2006-2.
NACIONALNI PREDGOVOR
Evropski standard EN 62305-3:2006 je pripravil tehnični odbor Evropskega komiteja za
standardizacijo v elektrotehniki CLC/TC 81X Zaščita pred delovanjem strele.
Slovenski standard SIST EN 62305-3:2006 je prevod evropskega standarda EN 62305-3:2006. V
primeru spora glede besedila slovenskega prevoda v tem standardu je odločilen izvirni mednarodni
standard v angleškem jeziku. Slovensko izdajo standarda je pripravil tehnični odbor SIST/TC STZ
Zaščita pred delovanjem strele.
Odločitev za izdajo tega standarda je dne 15. aprila 2006 sprejel SIST/TC STZ.
ZVEZA Z NACIONALNIMI STANDARDI
S privzemom tega mednarodnega standarda veljajo za omenjeni namen referenčnih standardov vsi
standardi, navedeni v izvirniku, razen tistih, ki so že sprejeti v nacionalno standardizacijo:
SIST EN 60079-10:2003 Električne naprave za eksplozivne plinske atmosfere – 10. del: Razdelitev
eksplozijsko ogroženih prostorov (IEC 60079-10:2002)
SIST EN 60079-14:2003 Električne naprave za eksplozivne plinske atmosfere – 14. del: Električne
inštalacije v eksplozijsko ogroženih prostorih (razen v rudnikih) (IEC
60079-14:2002)
SIST EN 61241-10:2005 Električne naprave za uporabo v prisotnosti gorljivega prahu – 10. del:
Razdelitev prostorov, v katerih je lahko prisoten gorljiv prah (IEC 61241-
10:2004)
SIST EN 61241-14:2005 Električne naprave za uporabo v prisotnosti gorljivega prahu – 14. del:
Izbira in inštalacija (IEC 61241-14:2004)
SIST EN 62305-1:2006 Zaščita pred delovanjem strele – 1. del: Splošna načela (IEC 62305-
1:2006)
SIST EN 62305-2:2006 Zaščita pred delovanjem strele – 2. del: Vodenje rizika (IEC 62305-
2:2006)
SIST EN 62305-4:2006 Zaščita pred delovanjem strele – 4. del: Električni in elektronski sistemi v
zgradbah (IEC 62305-4:2006)
SIST ISO 3864-1:2003 Grafični simboli – Opozorilne barve in opozorilni znaki – Načela
načrtovanja opozorilnih znakov na delovnem mestu in na javnih
površinah
OSNOVA ZA IZDAJO STANDARDA
– privzem standarda EN 62305-3:2006
II
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SIST EN 62305-3 : 2006
OPOMBE
– Povsod, kjer se v besedilu standarda uporablja izraz “evropski standard”, v
SIST EN 62305-3:2006 to pomeni “slovenski standard”.
– Nacionalni uvod in nacionalni predgovor nista sestavni del standarda
– Ta nacionalni dokument je enakovreden EN 62305-3:2006 in je objavljen z dovoljenjem
CENELEC
Avenue Marnix 17
B - 1000 Brussels
Belgija
This national document is identical with EN 62305-3:2006 and is published with the permission of
CENELEC
Avenue Marnix 17
B - 1000 Brussels
Belgium
III
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EVROPSKI STANDARD EN 62305-3
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM februar 2006
ICS: 29.020; 91.120.40
Slovenska izdaja
Zaščita pred delovanjem strele – 3. del: Fizična škoda na zgradbah in
nevarnost za živa bitja (IEC 62305-3:2006, spremenjen)
Protection against lightning – Part 3: Protection contre la foudre – Partie 3: Blitzschutz – Teil 3: Schutz von
Physical damages to structures and Dommages physiques sur les baulichen Anlagen und
life hazard structures et risques humains Personen
(IEC 62305-3:2006, modified) (CEI 62305-3:2006, modifieé) (IEC 62305-2:2006, modifiziert)
Ta evropski standard je CENELEC sprejel 1. februarja 2006. Člani CENELEC morajo izpolnjevati
notranje predpise CEN/CENELEC, s katerimi je predpisano, da mora biti ta standard brez kakršnih koli
sprememb sprejet kot nacionalni standard.
Najnovejši seznami teh nacionalnih standardov z njihovimi bibliografskimi podatki se na zahtevo lahko
dobijo pri Centralnem sekretariatu ali katerem koli članu CENELEC.
Ta evropski standard obstaja v treh izvirnih izdajah (angleški, francoski in nemški). Izdaje v drugih
jezikih, ki jih članice CENELEC na lastno odgovornost prevedejo in izdajo ter prijavijo pri Centralnem
sekretariatu CEN, veljajo kot uradne izdaje.
Člani CENELEC so nacionalni elektrotehniški komiteji Avstrije, Belgije, Cipra, Češke republike,
Danske, Estonije, Finske, Francije, Grčije, Irske, Islandije, Italije, Latvije, Litve, Luksemburga, Malte,
Madžarske, Nemčije, Nizozemske, Norveške, Poljske, Portugalske, Romunije, Slovaške, Slovenije,
Španije, Švedske, Švice in Združenega kraljestva.
CENELEC
Evropski komite za standardizacijo v elektrotehniki
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Centralni sekretariat: Rue de Stassart 36, B-1050 Bruselj
© 2006 CENELEC. Lastnice avtorskih pravic so vse države članice CENELEC. Ref. oznaka EN 62305-3:2006 E
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SIST EN 62305-3 : 2006
VSEBINA Stran
Predgovor k evropskemu standardu .6
Predgovor .9
Uvod .11
1 Področje uporabe .12
2 Zveze s standardi .12
3 Izrazi in definicije .13
4 Sistem zaščite pred delovanjem strele (LPS).15
4.1 Vrsta LPS .15
4.2 Načrtovanje LPS.16
4.3 Neprekinjenost jeklene armature v armiranobetonskih zgradbah.16
5 Zunanji sistem zaščite pred delovanjem strele .17
5.1 Splošno.17
5.2 Lovilni sistemi .17
5.3 Odvodni sistemi.20
5.4 Ozemljitveni sistem.23
5.5 Sestavni deli .25
5.6 Materiali in mere.27
6 Notranji sistem zaščite pred delovanjem strele.29
6.1 Splošno.29
6.2 Izenačitev potencialov strele .29
6.3 Električna izolacija zunanjega LPS .32
7 Vzdrževanje in pregledovanje LPS .33
7.1 Izvajanje pregledov.33
7.2 Vrste pregledov .33
7.3 Vzdrževanje.33
8 Ukrepi za zaščito pred poškodbami živih bitij zaradi napetosti dotika in koraka.33
8.1 Ukrepi za zaščito pred napetostjo dotika.33
8.2 Ukrepi za zaščito pred napetostjo koraka .34
Dodatek A (normativni): Nameščanje lovilnega sistema.35
Dodatek B (normativni): Najmanjši prerez kabelskega zaslona vstopajočega kabla za preprečitev
nevarnega iskrenja.40
Dodatek C (informativni): Delitev toka strele med odvodi .41
Dodatek D (informativni): Dodatne informacije za LPS za zgradbe s tveganjem eksplozije .45
Dodatek E (informativni): Smernice za načrtovanje, namestitev, vzdrževanje in pregledovanje
sistemov za zaščito pred delovanjem strele .50
Slika 1: Zanka v odvodu .22
Slika 2: Najmanjša dolžina l vsakega ozemeljila glede na vrsto LPS.24
1
Slika A.1: Prostor, ščiten z navpično lovilno palico .35
2
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SIST EN 62305-3 : 2006
Slika A.2: Prostor, ščiten z navpično lovilno palico .36
Slika A.3: Prostor, ščiten z lovilno žico.36
Slika A.4: Prostor, ščiten z izoliranimi žicami, povezanimi v mrežo, skladno z metodo
zaščitnega kota in metodo kotaleče krogle .37
Slika A.5: Prostor, ščiten z neizoliranimi žicami, povezanimi v mrežo, skladno z metodo
mreže in metodo zaščitnega kota .37
Slika A.6: Načrt lovilnega sistema po metodi kotaleče krogle.38
Slika C.1: Vrednosti koeficienta k pri lovilnem sistemu iz žice in ozemljitvenega sistema tipa B.42
c
Slika C.2: Vrednosti koeficienta k pri lovilnem sistemu iz mreže vodnikov in ozemljitvenega
c
sistema tipa B.43
Slika C.3: Primeri izračunavanja ločilne razdalje v lovilnem sistemu iz mreže vodnikov,
medsebojno povezanem obroču odvodov na vsakem nivoju in ozemljitvenem sistemu tipa B.44
Slika E.1: Diagram poteka načrtovanja LPS .51
Slika E.2: Vrednosti koeficienta k v primeru nagnjene strehe z lovilniki na slemenu in
c
ozemljitvenim sistemom tipa B.57
Slika E.3: Načrtovanje LPS pri zgradbah z napuščem.58
Slika E.4: Primer izenačitve potencialov v zgradbi z jekleno armaturo.60
Slika E.5: Varjeni spoji armaturnih palic v armiranem betonu, če je to dovoljeno.61
Slika E.6: Primer spojk, ki se uporabljajo kot spoji med armaturnimi palicami in vodniki .62
Slika E.7: Primeri povezovalnih točk na armaturo v armiranobetonski steni .63
Slika E.8: Uporaba kovinske fasade kot pomožni odvodni sistem in povezava fasadnih nosilcev.67
Slika E.9: Povezovanje neprekinjenih oken na kovinsko fasadno prekritje .58
Slika E.10: Notranji odvodi v industrijskih zgradbah .70
Slika E.11: Namestitev povezovalnih vodnikov v armiranobetonskih zgradbah in
pregibnih povezav med dvema armiranobetonskima deloma .72
Slika E.12: Načrtovanje lovilnika po metodi zaščitnega kota za različne višine
glede na preglednico 2.75
Slika E.13: Izolirani zunanji LPS z uporabljenima dvema izoliranima lovilnima stebroma,
načrtovan po načrtovalni metodi zaščitnega kota.76
Slika E.14: Izoliran zunanji LPS, sestavljen iz dveh izoliranih lovilnih stebrov, med seboj
povezanih z vodoravno obešeno žico.77
Slika E.15: Primer načrtovanja lovilnika neizoliranega LPS z lovilnimi palicami.78
Slika E.16: Primer načrtovanja lovilnika neizoliranega LPS z vodoravnim vodnikom
skladno z načrtovalno metodo zaščitnega kota .79
Slika E.17: Ščiteni prostor lovilne palice ali stebra na poševni površini.80
Slika E.18: Načrtovanje lovilnika LPS skladno z metodo kotaleče krogle, metodo zaščitnega kota,
metodo zanke in splošna razporeditev lovilnih sestavnih delov .81
Slika E.19: Načrtovanje mreže lovilnih vodnikov LPS na zgradbi z zapleteno obliko.82
Slika E.20: Prostor, ščiten z dvema vzporednima vodoravnima lovilnima žicama
ali dvema lovilnima palicama (r > h ).83
t
Slika E.21: Točke, v katerih strela lahko udari v stavbo.84
Slika E.22: Primer načrtovanja lovilnika neizoliranega LPS z uporabo
načrtovalne metode mreže.87
Slika E.23: Nekateri primeri detajlov LPS na zgradbi s poševno opečno streho .89
3
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SIST EN 62305-3 : 2006
Slika E.24: Namestitev LPS z uporabo pomožnih sestavnih delov na strehi zgradbe.90
Slika E.25: Namestitev zunanjega LPS na zgradbi iz izolacijskega materiala (npr. les, opeka),
visoki do 60 m, z ravno streho in s strešnimi pritiklinami .91
Slika E.26: Konstrukcija lovilnika na strehi s prevodnim prekritjem, kjer ni dovoljeno
preluknjanje prekritja .92
Slika E.27: Namestitev zunanjega LPS na armiranobetonsko zgradbo, kjer je armatura
zunanjih sten uporabljena kot pomožni sestavni del.93
Slika E.28: Primer lovilne gobice na strehi garažne hiše .94
Slika E.29: Uporaba lovilne palice za zaščito kovinskih pritiklin na strehi z električnimi
napajalnimi inštalacijami, ki niso povezane z lovilnim sistemom .94
Slika E.30: Metoda za doseganje električne prevodnosti na kovinsko prevlečeni ograji .95
Slika E.31: Kovinska strešna pritiklina, zaščitena pred direktnim udarom strele in povezana
z lovilnim sistemom .98
Slika E.32: Primer izdelave zaščite pred delovanjem strele na zgradbi s TV anteno,
katere nosilni drog je uporabljen kot lovilnik .99
Slika E.33: Namestitev strelovodne zaščite pred direktnim udarom strele za kovinsko opremo
na strehi. 100
Slika E.34: Povezovanje pomožne lovilne palice z lovilnimi vodniki . 102
Slika E.35: Povezovanje med segmenti kovinskih fasadnih plošč. 103
Slika E.36: Namestitev zunanjega LPS na zgradbi iz izolacijskega materiala in
z različnimi nivoji strehe . 105
Slika E.37: Primeri geometrije vodnikov LPS. 106
Slika E.38: Konstrukcija LPS ob uporabi samo dveh odvodov in temeljskega ozemljila . 107
Slika E.39: Primeri povezovanja ozemljila na LPS zgradbe s pomožnimi odvodi (nosilci)
in detajl preskusnega spoja. 111
Slika E.40: Konstrukcija temeljskega obročastega ozemljila pri zgradbah z različno
načrtovanimi temelji. 114
Slika E.41: Primera dveh navpičnih ozemljil pri razporeditvi ozemljil tipa A . 116
Slika E.42: Mrežni ozemljitveni sistem industrijskega kompleksa. 119
Slika E.43: Primeri ločilne razdalje med LPS in kovinskimi inštalacijami. 124
Slika E.44: Napotki za izračun ločilne razdalje s za najslabši primer točke udara strele
pri razdalji l od referenčne točke glede na točko 6.3. 125
Slika E.45: Primer razporeditve izenačitve potencialov . 128
Slika E.46: Primer razporeditve povezav v zgradbi z več vhodnimi mesti zunanjih prevodnih
delov z uporabo obročastega ozemljila za medsebojno povezavo zbiralk . 129
Slika E.47: Primer povezovanja pri več vhodnih mestih zunanjih prevodnih delov in električne
napajalne ali komunikacijske napeljave z uporabo notranjega obročastega vodnika za
medsebojno povezavo zbiralk . 130
Slika E.48: Primer razporeditve povezav v zgradbi z več vhodnimi mesti zunanjih prevodnih delov,
ki vstopajo v zgradbo nad zemljo. 131
Preglednica 1: Odnos med zaščitnimi nivoji (LPL) in vrstami LPS (glej IEC 62305-1) .16
Preglednica 2: Največje vrednosti polmera kotaleče krogle, velikosti mreže in zaščitnega kota .18
Preglednica 3: Najmanjša debelina kovinskih plošč ali kovinskih cevi v lovilnih sistemih .20
Preglednica 4: Značilne razdalje med odvodi in med obročastimi vodniki glede na vrsto LPS .21
4
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SIST EN 62305-3 : 2006
Preglednica 5: Materiali LPS in pogoji uporabe .26
Preglednica 6: Material, oblika in najmanjši prerez lovilnih vodnikov, lovilnih palic in odvodov .27
Preglednica 7: Material, oblika in najmanjše mere ozemljil.28
Preglednica 8: Najmanjše mere vodnikov, ki povezujejo različne zbiralke za izenačitev potencialov
ali povezujejo zbiralke za izenačitev potencialov na ozemljitveni sistem .30
Preglednica 9: Najmanjše mere vodnikov, ki povezujejo notranje kovinske inštalacije na zbiralke
za izenačitev potencialov .30
Preglednica 10: Izolacija zunanjega LPS – vrednosti koeficienta k .32
i
Preglednica 11: Izolacija zunanjega LPS – vrednosti koeficienta k .32
c
Preglednica 12: Izolacija zunanjega LPS – vrednosti koeficienta k .32
m
Preglednica B.1: Dolžina kabla, ki se upošteva glede na stanje zaslona .40
Preglednica C.1: Vrednost koeficienta k .41
c
Preglednica E.1: Predlagana mesta pritrditev.88
Preglednica E.2: Najdaljše obdobje med pregledi LPS. 133
5
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SIST EN 62305-3 : 2006
Predgovor k evropskemu standardu
Besedilo dokumenta 81/264/FDIS. prihodnje 1. izdaje IEC 62305-3, ki ga je pripravil tehnični odbor
ISO/TC 81 Strelovodna zaščita, je CENELEC 1. februarja 2006 po vzporednem glasovanju v IEC in
CENELEC sprejel kot EN 62305-3.
Osnutek dopolnila, ki ga je pripravil tehnični odbor CENELEC TC 81X, Zaščita pred strelo, vsebuje
nekaj skupnih sprememb dokumenta 81/264/FDIS in je bil dan v formalno glasovanje ter ga je
CENELEC 1. februarja 2006 potrdil za vključitev v EN 62305-3.
Določena sta bila naslednja datuma:
– zadnji datum, do katerega mora EN dobiti status
nacionalnega standarda bodisi z objavo istovetnega besedila
ali z razglasitvijo (dop) 2006-11-01
– zadnji datum, ko je treba razveljaviti nacionalne standarde,
ki so z EN v nasprotju (dow) 2009-02-01
Ta evropski standard vsebuje sklicevanje na mednarodne standarde. Kadar je bil mednarodni
standard, na katerega se sklicuje, privzet kot evropski standard ali kadar obstaja izvirni evropski
standard, je treba namesto njega uporabiti evropski standard. Informacije v zvezi s tem je mogoče
najti na spletni strani CENELEC.
6
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SIST EN 62305-3 : 2006
Razglasitvena objava
Besedilo mednarodnega standarda IEC 62305-3:2006 je CENELEC odobril kot evropski standard s
sprejetimi skupnimi spremembami, kot so navedene spodaj.
SKUPNE SPREMEMBE
3 Izrazi in definicije
Naslednji definiciji se spremenita tako, da se glasita:
3.16
povezovalni element
del zunanjega LPS, ki se uporablja za povezavo vodnikov med seboj ali na kovinske inštalacije, kot je
določen v skupini standardov EN 50164
3.17
pritrjevalni element
del zunanjega LPS, ki se uporablja za pritrjevanje elementov LPS na ščiteno zgradbo, kot je določen v
skupini standardov EN 50164
Dodatek E
E.4.3.3 Varjenje ali spajanje na jeklene armaturne palice
Opomba se spremeni tako, da se glasi:
OPOMBA: Uporabljajo naj se sponke, ki so posebej načrtovane in preskušene v skladu s skupino standardov EN 50164.
E.4.3.7 Odvodi
Dvanajsti odstavek se spremeni tako, da se glasi:
Če se kot odvodi uporabljajo jeklene konstrukcije, mora biti vsak jeklen steber povezan z jeklenimi
armaturnimi palicami betonskih temeljev, kot je prikazano na sliki E.8., v povezovalnih točkah v skladu
s skupino standardov EN 50164.
E.5.2.4.1 Splošne informacije
Prvi odstavek se spremeni tako, da se glasi:
Najvišja dovoljena temperatura vodnika ne bo prekoračena, če je prerez vodnika v skladu s
preglednico 6 in skupino standardov EN 50164.
E.5.2.4.2 Neizolirani lovilnik
Na koncu drugega odstavka se doda:
OPOMBA Z1: Za več podrobnosti glej skupino standardov EN 50164.
E.5.5 Sestavni deli
Besedilo točke se zamenja z naslednjim:
7
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SIST EN 62305-3 : 2006
Sestavni deli LPS morajo zdržati elektromagnetne učinke toka strele in predvidene naključne
obremenitve brez poškodb. To se lahko doseže z izbiro sestavnih delov, ki so bili uspešno preskušeni
v skladu s skupino standardov EN 50164.
Vsi sestavni deli morajo biti skladni s skupino standardov EN 50164.
E.5.6.1 Mehansko načrtovanje
Šesti odstavek se spremeni tako, da se glasi:
Načrtovalec in inštalater LPS naj določita pritrditve in spoje vodnikov, ki bodo zdržali elektrodinamične
sile toka strele v vodnikih ter obenem dovoljevali raztezanje in krčenje vodnikov zaradi ustreznega
temperaturnega porasta, v skladu s skupino standardov EN 50164.
E.5.6.2.1 Materiali
Prvi odstavek se spremeni tako, da se glasi:
Materiali za LPS in pogoji uporabe so navedeni v preglednici 5 in v skupini standardov EN 50164.
E.5.6.2.2.1 Kovine v zemlji in na zraku
Opomba se spremeni tako, da se glasi:
OPOMBA: Ustrezna so iskrišča z zaščitnim nivojem U je 2,5 kV in najmanjšim tokom I 50 kA (10/350 µs) ter skladna s
p imp
standardom EN 50164-3.
8
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SIST EN 62305-3 : 2006
Predgovor
1. IEC (Mednarodna elektrotehniška komisija) je svetovna organizacija za standardizacijo, ki združuje vse
nacionalne elektrotehnične komiteje (nacionalni komiteji IEC). Cilj IEC je pospeševati mednarodno
sodelovanje v vseh vprašanjih standardizacije s področja elektrotehnike in elektronike. V ta namen
poleg drugih aktivnosti izdaja mednarodne standarde. Za njihovo pripravo so odgovorni tehnični odbori
(TC). Vsak nacionalni komite IEC, ki ga zanima obravnavana tema, lahko sodeluje v tem
pripravljalnem delu. Prav tako lahko v pripravi sodelujejo mednarodne organizacije ter vladne in
nevladne ustanove, ki so povezane z IEC. IEC deluje v tesni povezavi z mednarodno organizacijo za
standardizacijo ISO skladno s pogoji, določenimi v soglasju med obema organizacijama.
2. Uradne odločitve ali sporazumi IEC o tehničnih vprašanjih, pripravljeni v tehničnih odborih, kjer so
prisotni vsi nacionalni komiteji, ki jih tema zanima, izražajo, kolikor je mogoče, mednarodno
soglasje o obravnavani temi.
3. Publikacije IEC imajo obliko priporočil za mednarodno uporabo ter jih kot takšne sprejmejo
nacionalni komiteji IEC. Čeprav IEC skuša zagotavljati natančnost tehničnih vsebin v publikacijah
IEC, IEC ni odgovoren za način uporabe ali za možne napačne interpretacije končnih
uporabnikov.
4. Da bi se pospeševalo mednarodno poenotenje, so nacionalni komiteji IEC v svojih nacionalnih in
regionalnih standardih dolžni čim pregledneje uporabljati mednarodne standarde. Vsako
odstopanje med standardom IEC in ustreznim nacionalnim ali regionalnim standardom je treba v
slednjem jasno označiti.
5. IEC ni določil nobenega postopka v zvezi z označevanjem kot znakom strinjanja in ne prevzema
nikakršne odgovornosti za opremo, ki je deklarirana, da ustreza kateremu od publikacij IEC.
6. Vsi uporabniki naj bi si zagotovili zadnjo izdajo teh publikacij.
7. IEC ali njegovi direktorji, zaposleni, uslužbenci ali agenti, vključno s samostojnimi strokovnjaki ter
člani tehničnih odborov in nacionalnih komitejev IEC, ne prevzemajo nobene odgovornosti za
kakršno koli osebno poškodbo, š
...
81/240/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJET DE COMITÉ POUR VOTE (CDV)
Project number IEC 62305-3, Ed.1
Numéro de projet
IEC/TC or SC: Date of circulation Closing date for voting (Voting
TC 81
Date de diffusion mandatory for P-members)
CEI/CE ou SC:
Date de clôture du vote (Vote
2004-01-09
obligatoire pour les membres (P))
2004-06-11
Titre du CE/SC: Protection contre la foudre TC/SC Title: Lightning protection
Secretary: Dr. Ing. G.B. Lo Piparo (Italy)
Secrétaire: E-mail: lopiparo@rai.it
Also of interest to the following committees Supersedes documents
Intéresse également les comités suivants Remplace les documents
SC 37A, TC 64, TC 77 81/214/CD – 81/223A/CC
Functions concerned
Fonctions concernées
Safety EMC Environment Quality assurance
Sécurité
CEM Environnement Assurance qualité
CE DOCUMENT EST TOUJOURS À L'ÉTUDE ET SUSCEPTIBLE DE THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT
MODIFICATION. IL NE PEUT SERVIR DE RÉFÉRENCE. SHOULD NOT BE USED FOR REFERENCE PURPOSES.
LES RÉCIPIENDAIRES DU PRÉSENT DOCUMENT SONT INVITÉS À RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR
PRÉSENTER, AVEC LEURS OBSERVATIONS, LA NOTIFICATION DES COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF
DROITS DE PROPRIÉTÉ DONT ILS AURAIENT ÉVENTUELLEMENT WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING
CONNAISSANCE ET À FOURNIR UNE DOCUMENTATION EXPLICATIVE. DOCUMENTATION.
Titre : CEI 62305-3, Ed. 1: Protection contre la Title : IEC 62305-3, Ed. 1: Protection against
foudre - Partie 3: Dommages physiques sur les lightning - Part 3: Physical damage to structures
structures et risques humains and life hazard
Note d'introduction Introductory note
This document has been prepared based on the decisions taken at the last TC 81 meeting, (see
81/236/RM item 7). According to these decisions National Committees are asked (see 81/239/DC) for
opinion on the following editorial proposal:
1. to delete in IEC 62305-3 the Annex B (informative): Lightning current flowing through external
conductive parts and installations entering the structure (see doc. 81/240/CDV)
2. to delete in IEC 62305-4 the Annex E (informative): Surges due to lightning at different installation
point(see doc. 81/238/CDV)
3. to add to IEC 62305-1 a new Annex E (informative) incorporating the Annex B of IEC 62305-3 and
the Annex E of IEC 62305-4. The proposed new Annex E of IEC 62305-1 is attached.
ATTENTION ATTENTION
CDV soumis en parallèle au vote (CEI) Parallel IEC CDV/CENELEC Enquiry
et à l’enquête (CENELEC)
Copyright © 2004 International Electrotechnical Commission, IEC. All rights reserved. It is
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
printed version of the document, or any part of it, for any other purpose without permission in
writing from IEC.
FORM CDV (IEC)
2002-08-09
---------------------- Page: 1 ----------------------
62305-3 Ed. 1/CDV IEC – 2 –
CONTENTS
Page
FOREWORD.3
INTRODUCTION.4
Clause
1 Scope.5
2 Normative references .5
3 Terms and definitions .6
4 Lightning Protection System (LPS) .9
4.1 Type of LPS .9
4.2 Design of the LPS .9
4.3 Continuity of steelwork in reinforced concrete structure 10
5 External lightning protection system .10
5.1 General .10
5.2 Air-termination systems.11
5.3 Down-conductor systems.13
5.4 Earth-termination system.15
5.5 Fixing and connections.18
5.6 Materials and dimensions .17
6 Internal lightning protection system .17
6.1 General .17
6.2 Lightning equipotential bonding .18
6.3 Electrical insulation of the external LPS.20
7 Maintenance and inspection of an LPS .21
7.1 Scope of inspections .21
7.2 Order of inspections .21
7.3 Maintenance.21
8 Protection measures against injuries of living beings due to touch and step
voltages
8.1 Protection measures against touch voltages
8.2 Protection measures against step voltages
Annex A (normative) Positioning of air–termination system .33
A.1 Positioning of the air–termination system when utilizing the protective angle
method.32
A.2 Positioning of the air-termination system utilizing the rolling sphere method.32
A.3 Positioning of the air–termination system utilizing the mesh method.32
Annex B (informative) Lightning current flowing through external conductive parts and
installations connected to the structure.39
Annex C (normative) Minimum cross section of the screen for self-protection of a
cable .41
Annex D (informative) Partitioning of the lightning current amongst down-conductors .42
Annex E (informative) Additional information for LPS in the case of structures with risk
of explosion .46
Annex F (informative) Guideline for design, installation, maintenance and inspection of
lightning protection systems.47
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62305-3 Ed. 1/CDV IEC – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
IEC 62305 – PROTECTION AGAINST LIGHTNING
IEC 62305-3 Part 3: PHYSICAL DAMAGE TO STRUCTURES AND LIFE
HAZARD
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liasing
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62305-3 has been prepared by IEC Technical Committee 81:
Lightning protection.
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annexes B, D, E and F are for information only.
Annexes A and C form an integral part of this standard.
The committee has decided that the contents of this publication will remain unchanged until
______. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
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62305-3 Ed. 1/CDV IEC – 4 –
INTRODUCTION
This part of IEC 62305 deals with the protection, in a structure, against physical damages and
injuries of living beings due to touch and step voltages.
The main and most effective measure for protection of structures against physical damages
is considered to be the lightning protection system (LPS). It usually consists of both external
and internal lightning protection systems.
External LPS is intended to:
a) intercept a direct lightning strike to the structure (with an air termination system);
b) conduct the lightning current safely towards earth (using a down-conductor system);
c) disperse the lightning current into the earth (using an earth termination system).
Internal LPS prevents dangerous sparking within the structure using either equipotential
bonding or a separation distance (and hence electrical insulation) between the external LPS
(as defined in 3.2) components and other electrically conducting elements internal to the
structure.
Main protection measures against injuries to living beings due to touch and step voltages are
intended to:
a) reduce the dangerous current flowing through the bodies by insulation of exposed
conductive parts, and/or by increasing the surface soil resistivity;
b) reduce the occurrence of dangerous touch and step voltages by physical restrictions
and/or by warning notices.
The type and location of an LPS should be carefully considered in the initial design of a new
structure, thereby enabling maximum advantage to be taken of the electrically conductive
parts of the structure. Thus design and construction of an integrated installation is made
easier, the overall aesthetic aspects can be improved, and the effectiveness of the lightning
protection system can be increased at minimum cost and effort.
Access to ground and the proper use of foundation steelwork for the purpose of forming an
effective earth termination may well be impossible once construction work on a site has
commenced. Therefore, soil resistivity and the nature of the earth should be considered at the
earliest possible stage of a project. This information is fundamental to the design of an earth
termination system and this may influence the foundation design work for the structure.
Regular consultation between LPS designers and installers, architects and builders is
essential in order to achieve the best result at minimum cost.
If lightning protection is to be added to an existing structure, every effort should be made to
ensure that it complies with the principles of this standard. The design of the type and location
of LPS should take into account the features of the existing structure.
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62305-3 Ed. 1/CDV IEC – 5 –
IEC 62305 – PROTECTION AGAINST LIGHTNING
IEC 62305-3 Part 3: PHYSICAL DAMAGE TO STRUCTURES AND
LIFE HAZARD
1 Scope
This part of IEC 62305 provides the requirements for protection of a structure against physical
damages by means of a lightning protection system (LPS), and for protection against injuries
to living beings due to touch and step voltages in the vicinity of LPS (see IEC 62305-1).
This standard is applicable to:
a) design, installation, inspection and maintenance of LPS for structures without limitation
of their height;
b) erection of measures for protection against injuries of living beings due to touch and
step voltages.
NOTE 1 - Specific requirements for LPS in structures dangerous to their surroundings due to the risk of explosion are
under consideration. Additional information is provided in Annex E for use in the interim.
NOTE 2 - This part of IEC 62305 is not intended to provide protection against failures of electrical and
electronic systems due to overvoltages. Specific requirements for such cases are provided in IEC
62305-4.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 62305. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of IEC 62305 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC 60079-10,1995: Electrical apparatus for explosive gas atmospheres – Part
10:Classification of hazardous areas
IEC 62305-1 (*) : Protection against lightning – Part 1: General principles
IEC 62305-2 (*) : Protection against lightning – Part 2: Risk management
IEC 62305-4 (*) : Protection against lightning – Part 4: Electrical and electronic systems
within structures
IEC 62305-5 (*) : Protection against lightning – Part 5: Services
IEC 61643-1, 2002: Surge protective devices connected to low-voltage power distribution
systems – Part 1: Performance requirements and testing methods
IEC 61643-12,2002: Surge protective devices connected to low voltage power distribution
systems. Part 12 : Selection and application principles.
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62305-3 Ed. 1/CDV IEC – 6 –
IEC 60479 (*) : Effects of current on human body and livestock- New Part 4: Effects of
lightning strokes on human beings and livestock
(*) to be published
3 Terms and definitions
For the purpose of this part of IEC 62305, the following definitions apply as well as those
given in other parts of IEC 62305.
3.1 Lightning protection system (LPS)
Complete system used to reduce physical damages due to lightning flashes striking a
structure. It consists of both external and internal lightning protection systems.
3.2 External lightning protection system
Part of the LPS consisting of an air-termination system, a down-conductor system and an
earth-termination system
NOTE Typically these parts are outside the structure.
3.3 External LPS isolated from the structure to be protected
LPS whose air termination system and down-conductor system are positioned in such a way
that the path of the lightning current has no contact with the structure to be protected.
NOTE – In an isolated LPS dangerous sparks between LPS and the structure are avoided.
3.4 External LPS not isolated from the structure to be protected
LPS whose air termination system and down-conductor system are positioned in such a way
that the path of the lightning current can be in contact with the structure to be protected
3.5 Internal lightning protection system
Part of the LPS consisting of lightning equipotential bonding and compliance with the
separation distance within the structure to be protected
3.6 Air-termination system
Part of an external LPS using metallic elements such as rods, mesh conductors or catenary
wires which is intended to intercept lightning flashes.
3.7 Down-conductor system
Part of an external LPS which is intended to conduct lightning current from the air-termination
system to the earth-termination system.
3.8 Ring conductor
Conductor forming a loop around the structure and interconnecting the down-conductors for
distribution of lightning current among them.
3.9 Earth-termination system
Part of an external LPS which is intended to conduct and disperse lightning current into the
earth.
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62305-3 Ed. 1/CDV IEC – 7 –
3.10 Earthing electrode
Part or a group of parts of the earth-termination system which provides direct electrical
contact with the earth and disperses the lightning current to the earth.
3.11 Ring earthing electrode
Earthing electrode forming a closed loop around the structure below or on the surface of the
earth.
3.12 Foundation earthing electrode
Reinforced steel of foundation or additional conductor embedded in the concrete foundation of
a structure and used as an earthing electrode.
3.13 Conventional earth impedance
Ratio of the peak values of the earth-termination voltage and the earth-termination current
which, in general, do not occur simultaneously.
3.14 Earth-termination voltage
Potential difference between the earth-termination system and the remote earth.
3.15 “Natural” component of LPS
Conductive component installed not specifically for lightning protection which can be used in
addition to the LPS or in some cases could provide the function of one or more parts of the
LPS.
NOTE - Examples of the use of this term include:
- “natural” air termination;
- “natural” down-conductor;
- “natural” earthing electrode.
3.16 Connecting component
That part of an external LPS which is used for the connection of conductors to each other or
to metallic installations.
3.17 Fixing component
That part of an external LPS which is used to fix the elements of the LPS to the structure to
be protected.
3.18 Metal installations
Extended metal items in the structure to be protected which may form a path for lightning
current, such as pipe-work, staircases, elevator guide rails, ventilation, heating and air
conditioning ducts, and interconnected reinforcing steel.
3.19 External conductive parts
Extended metal items entering or leaving the structure to be protected such as pipe works,
cable metallic elements, metal ducts, etc. which may carry a part of the lightning current
3.20 Electrical system
A system incorporating low voltage power supply components and possibly electronic
components.
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62305-3 Ed. 1/CDV IEC – 8 –
3.21 Electronic system
A system incorporating sensitive electronic components such as communication equipment,
computer, control and instrumentation systems, radio systems, power electronic installations.
3.22 Internal system
Electrical and electronic systems within a structure
3.23 Lightning equipotential bonding (EB)
Bonding to LPS of separated conducting parts, by direct connections or via surge protective
devices, to reduce potential differences caused by lightning current.
3.24 Bonding bar
Metal bar on which metal installations, external conductive parts, electric power and
telecommunication lines, and other cables can be bonded to an LPS.
3.25 Bonding conductor
Conductor connecting separated conducting parts to LPS.
3.26 Interconnected reinforcing steel
Steelwork within a concrete structure which is considered electrically continuous.
3.27 Dangerous sparking
Electrical discharge due to lightning which causes physical damages in the structure to be
protected.
3.28 Separation distance
Distance between two conductive parts at which no dangerous sparking can occur
3.29 Surge protective device (SPD)
Device that is intended to limit transient overvoltages and divert surge currents. It contains at
least one non-linear component (Defined as in IEC 61643-12).
3.30 Test joint
Joint designed to facilitate electrical testing and measurement of LPS components.
3.31 Type of LPS
Number denoting the classification of an LPS according to the lightning protection level for
which it is designed.
3.32 Lightning protection designer
Specialist competent and skilled in the design of the LPS
3.33 Lightning protection installer
A person competent and skilled in the installation of LPS
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62305-3 Ed. 1/CDV IEC – 9 –
4 Lightning Protection System (LPS)
4.1 Type of LPS
The characteristics of an LPS are determined by the characteristics of the structure to be
protected and by the considered lightning protection level.
Four types of LPS (I to IV) are defined in this standard corresponding to lightning protection
levels defined in IEC 62305-1(see Table 1).
Each type of LPS is characterised by:
a) Data depending on the type of LPS:
− lightning parameters (Table 3 and 4 in IEC 62305-1)
− rolling sphere radius, mesh size and protection angle (Table 2)
− typical distances between down-conductors and between ring conductors (Table 4)
− separation distance against dangerous sparking (Tables 10, 11, 12)
− minimum length of earth electrodes (see 5.4.2, 5.4.3 and figure 2)
b) Data not depending on the type of LPS:
− lightning equipotential bonding (see 6.2)
− minimum thickness of metal sheets or metal pipes in air-termination systems (Table 3)
− LPS materials and conditions of use (see 5.5, 5.6 and table 5)
− Material, configuration and minimum dimensions for air terminations, down-conductors
and earth terminations (Table 6 and 7)
− Minimum dimensions of connecting conductors (Tables 8 and 9)
Performance of each type of LPS is reported in IEC 62305-2, Annex B.
The type of required LPS shall be selected on the basis of a risk assessment (see IEC 62305-
2).
4.2 Design of the LPS
A technically and economically optimised design of an LPS is possible especially if the steps
in the design and construction of the LPS are co-ordinated with the steps in the design and
construction of the structure to be protected. In particular, the possible utilisation of metal
parts of a structure as parts of the LPS should be foreseen in the design of the structure itself.
The design of the type and location of the LPS for existing structures shall take into account
the constraints of the existing situation.
The design documentation of an LPS shall contain all the information necessary to ensure
correct and complete installation. For detailed information see Annex F.
4.3 Continuity of steelwork in reinforced concrete structures
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62305-3 Ed. 1/CDV IEC – 10 –
Steelwork within reinforced concrete structures is considered to be electrically continuous
provided that the major part of interconnections of vertical and horizontal bars are welded or
otherwise securely connected. Connections of vertical bars are to be welded, overlapped a
minimum of 20 times their diameters or otherwise securely connected.
For new structures, the connections between reinforcement elements shall be specified by the
designer or installer, in co-operation with the builder and the civil engineer.
For structures utilizing steel reinforced concrete (including pre-cast, pre-stressed reinforced
units), the electrical continuity of the reinforcing bars shall be determined by electrical testing
between the uppermost part and ground level. The overall electrical resistance should not be
greater than 0,2 ohm, measured using test equipment suitable for this purpose. If this value is
not achieved or it is not practical to conduct such testing, the reinforcing steel shall not be
used as a natural down conductor as discussed in 5.3.5. In this case it is recommended that
an external down conductor be installed.
In the case of structures of precast reinforced concrete, the electrical continuity of the
reinforcing steel shall be established between individual adjacent precast concrete units.
NOTE 1 For further information on the continuity of steelwork in reinforced concrete structures see Annex F.
NOTE 2 In several countries, the use of reinforced concrete as a part of the LPS is not allowed.
5 External lightning protection system
5.1 General
5.1.1 Scope of an external LPS
The external LPS is intended to intercept direct lightning strokes to the structure, including
flashes to the side of structure, to conduct lightning current from the point of strike to ground.
The external LPS is also intended to disperse this current to earth without causing thermal or
mechanical damage, nor dangerous sparking which may trigger fire or explosions.
5.1.2 Choice of external LPS
In most cases, the external LPS may be attached to the structure to be protected.
An isolated external LPS should be considered when the thermal and explosive effects at the
point of strike or on the conductors carrying the lightning current may cause damage to the
structure or to the contents (see Annex E). Typical examples include structures with
combustible covering, structures with combustible walls and areas with danger of explosion
and fire.
NOTE 1 The use of an isolated LPS may be convenient where it is predicted that changes in the structure, its
contents or its use will require modifications to the LPS.
Dangerous sparking between LPS and the structure shall be avoided:
• in an isolated external LPS, by separation in accordance with 6.3;
• in a non-isolated external LPS, by bonding, in accordance with 6.2, or by insulation or
separation in accordance with 6.3.
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62305-3 Ed. 1/CDV IEC – 11 –
5.1.3 Use of natural components
Natural components made of conductive materials which will always remain in the structure
and will not be modified (e.g. interconnected reinforced steel, metal framework of the
structure, etc.) may be used as parts of an LPS.
Other natural components should be considered as being additional to an LPS.
NOTE For further information, see Annex F.
5.2 Air termination systems
5.2.1 General
The probability of structure penetration by a lightning current is considerably decreased by
the presence of a properly designed air termination system.
The air termination systems can be composed of any combination of the following elements:
a) Rods (including free-standing masts);
b) catenary wires;
c) meshed conductors.
To comply with this standard all types of air termination systems shall be positioned in
accordance with 5.2.2, 5.2.3 and Annex A.
Radio-active air terminals are not allowed.
5.2.2 Positioning
Air termination components installed on a structure should be located at corners, exposed
points, and edges (especially on the upper level of its facades) in accordance with one or
more of the following methods.
Acceptable methods to be used in determining the position of the air termination system. are
the “protection angle” method, the “rolling sphere” method and the “mesh” method.
The rolling sphere method is suitable in all cases.
The protection angle method is suitable for simple shaped buildings but it is subject to limits
of air termination height indicated in Table 2.
The mesh method is a suitable form of protection where plane surfaces are to be protected.
The values for the protection angle, rolling sphere radius and mesh size for each type of LPS
are given in Table 2. Detailed information on the positioning of the air termination system is
given in Annex A.
5.2.3 Air terminations against flashes to the side of tall structures
On structures taller than 60 m, flashes to the side may occur; especially to points, corners
and edges of surfaces.
NOTE In general the risk due to these flashes is low, because only a few percent of all flashes to tall structures
will be flashes to the side and moreover their parameters are significantly lower than those of flashes to
the top. However Electrical and electronic equipment on the wall outside the structure may be destroyed
even by lightning strokes with low current peak values.
An air termination systems shall be installed to protect the upper part of tall structures (i.e.
typically the topmost 20% of the height of the structure) and the equipment installed on it (see
Annex A).
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62305-3 Ed. 1/CDV IEC – 12 –
The rules for positioning air termination systems on the roof shall also apply to those upper
parts of the structure.
In addition, for building higher than 120 m, all parts
...
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